CN105839653B - A kind of immersed tube tunnel rebuilds the construction method of seepage prevention of cofferdam system - Google Patents
A kind of immersed tube tunnel rebuilds the construction method of seepage prevention of cofferdam system Download PDFInfo
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- CN105839653B CN105839653B CN201610330307.7A CN201610330307A CN105839653B CN 105839653 B CN105839653 B CN 105839653B CN 201610330307 A CN201610330307 A CN 201610330307A CN 105839653 B CN105839653 B CN 105839653B
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- weir body
- cofferdam
- jackstone
- weir
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/36—Concrete or concrete-like piles cast in position ; Apparatus for making same making without use of mouldpipes or other moulds
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Abstract
The invention belongs to water conservancy construction technical fields, are related to the construction method that a kind of immersed tube tunnel rebuilds seepage prevention of cofferdam system, and step is：Residue after being destroyed by rush of water using cofferdam of original fills sand long tube bag and riverbed as substrate, jackstone weir body and outside jackstone weir body on the inside of the formation of substrate both sides jackstone block；Clay is filled between interior side throwing stone weir body and outside jackstone weir body and forms first grade clay weir body, inside jackstone weir body, outside jackstone weir body and first grade clay weir body constitute earth rock cofferdam, after the completion of earth rock cofferdam construction, two level clay weir body is filled above earth rock cofferdam, construction plastic concrete hole-drilling interlocking pile, the seepage prevention system as earth rock cofferdam in the middle part of the body of first grade clay weir.The present invention can be destroyed by rush of water in a former cofferdam after residue fill sand long tube bag and riverbed on the basis of quickly rebuild cofferdam, form stable earth rock cofferdam and its seepage prevention system, ensure that remaining civil engineering in cofferdam reaches the execution conditions of anhydrous operation.
Description
Technical field
The present invention relates to the construction methods that a kind of immersed tube tunnel rebuilds seepage prevention of cofferdam system, belong to water conservancy construction technology neck
Domain.
Background technology
Red paddy Tunnel Passing Ganjiang River, connection Hong Gu beaches new district and eastern bank old town, apart from upstream Nanchang bridge 1.4km, away from
It is east-west two-way six-lane urban transportation backbone from downstream August I Bridge 2.3km.Tunnel overall length 9.3km crosses river section and adopts
With immersed tube, length 1329m.Tunnel is using " quick to cross river, underwater grade separation, multiple spot evacuation, thing perforation " design, in Fenghe
Main road and Joyous Garden road intersection, lay eastwards along Joyous Garden road, a pair of of entrance are set in Hong Guzhong main roads, are worn under main line big in red paddy
Main road in road and Ganjiang River passes through Ganjiang River and middle bar with form of straight lines, is connected eastern bank with underwater interchange, respectively in riverine
Main road south, north both sides respectively set 1 pair of entrance, and Zhongshan Road West sets 1 pair of entrance, and southern exposure continent Road sets 1 outlet.To meet immersed tube
Requirement is docked with secretly burying section, end monoblock type, both sides separate type is set to fill sand long tube bag Temporary Cofferdam and its impervious body in eastern bank
System partition Gan Jiangshui.
Eastern bank cofferdam axis is about 651m, and end slope foot gos deep into length 320m in river, into Ganjiang River main channel.It fills in cofferdam
Height about 20m, bottom width about 120m, top width about 10m, about 700,000 sides measure in the side of filling, respectively in 18.5m elevations and 9.7m
Elevation sets the platform of 3.0m wide.Outer side edges slope slope is than being respectively 1 in the body of weir:2.5 and 1:3.0, cofferdam side slope protection uses sand ovum
Stone bed course+gabion net pad.Sand long tube bag and intermediate sand core cross-sectional configuration are filled in below 16.7m cofferdam using both sides, in sand core model
It encloses construction three axes agitating pile cell wall and reinforces and separate Gan Jiangshui with plastic concrete cut-off wall.The external side in more than 16.7m weirs is clay
Seepage-proof dip dire, sand long tube bag is is filled in inside.
Nanchang City fill in Hong Gu tunnels sand long tube sack cofferdam be domestic inland river scale most, by force majeure Ganjiang River winter fishing season flood
Peak, flood cover rapidly weir crest, and moment forms big drop torrent and directly descends cascading waterfalls, side slope in wide scouring cofferdam, punching damage
Mould bag washes away interior weir sand body and intermediate sand core bulk cargo, leads to end weir body integral thinned, cofferdam three axes agitating pile and plasticity coagulation
Native cut-pff wall is destroyed, and only outer weir body can not resist the high hydraulic pressure in Ganjiang River, outer weir body mould bag also by the drawing crack of flood many places, and then
Outer weir body mould bag sand is washed away by flood, and as inside and outside weir body is rushed to open notch in succession and expands rapidly, final flood destroys by rush of water weir
Body.
In the repair process of river cofferdam, the general immersed tube tunnel using the construction of axis dry-docking method is after section floating undocks
It needs to apply secondary cofferdam and keeps apart dry-docking and river, then the water in dry-docking is drained and carries out secondary excavation.General feelings
Condition secondary cofferdam for immersed tube tunnel scheme mainly has film bag sand cofferdam, concrete segment cofferdam and an earth rock cofferdam, and Guangzhou Biological Island-
For university city's immersed tube tunnel when constructing secondary cofferdam, engineers and technicians have done relevant research and exploration, with reference to immersed tube tunnel
Construction characteristic has gone out a kind of secondary cofferdam for immersed tube tunnel impervious body using underwater self-compaction non-dispersible concrete technological development for the first time
The construction method of system.
Invention content
It for cofferdam is rebuild in river, is affected by River Hydrology condition, construction environment is complicated, and difficulty of construction is high, cofferdam
The problem of need to removing and restoring original bed, the present invention provides a kind of immersed tube tunnel rebuild seepage prevention of cofferdam system construction method,
Its work progress is simply controllable, helps quickly to rebuild cofferdam and ensures its durability.
The present invention is realized by following technical proposals.A kind of immersed tube tunnel rebuilds the construction method of seepage prevention of cofferdam system,
It is characterized in that step is as follows：
First, the residue after being destroyed by rush of water using cofferdam of original fills sand long tube bag and riverbed as substrate, in substrate both sides jackstone block
Form inside jackstone weir body and outside jackstone weir body；
2nd, clay is filled between interior side throwing stone weir body and outside jackstone weir body and forms first grade clay weir body, inside jackstone
Weir body, outside jackstone weir body and first grade clay weir body constitute earth rock cofferdam, after the completion of earth rock cofferdam construction, on earth rock cofferdam
Fill two level clay weir body in side；
3rd, construction plastic concrete hole-drilling interlocking pile in the middle part of the body of first grade clay weir.
Further preferably, weir body is destroyed by rush of water along axis often concave gap, plastic concrete hole-drilling interlocking pile operation model
Exclosure layer is mainly the back-up sand of long tube bag and clay do not destroyed by rush of water, and wherein gap both sides layer of sand is thicker, and intermediate layer of sand is relatively thin, is
Ensure to rebuild the intensity of cofferdam weakness, plastic concrete hole-drilling interlocking pile corner and with original plastic concrete cut-off wall
Joint part construction triple pipe spiral spraying pile.
Further preferably, the side slope and top surface in first grade clay weir body and two level clay weir body is laid with reinforced mesh simultaneously
Mould builds early strength concrete；Side slope top of the slope, bottom of slope and knick point position reinforced mesh must continuously be set.Side slope and top of the slope are squeezed into solid
Determine the mesh sheet reinforcing bar of reinforcing bar, reinforcing bar and reinforced mesh binding are secured.
Further preferably, before side slope surface concrete construction pre-buried pvc pipe as drain hole, sluicing pitch of holes 2500 ×
2500mm, pvc pipe length be 0.5m, outsourcing bilayer 80 mesh Dense mesh screens.
More specifically, in step 1, stone is transported to river middle-end head circumference weir using ship, using Grab stone according to
Cofferdam axis carries out underwater throwing and closes up weir body；During the body construction of jackstone weir, periodically weir body is carried out to sweep survey, it is ensured that the weir bodily form
Shape and Slope ratio meet design requirement.The weir body upstream face jackstone side slope ratio of earth rock cofferdam is 1:1.5, back side jackstone side slope
Slope ratio is 1:1.2；The side Slope ratio that meets water of outside jackstone weir body is 1:1.5, land side Slope ratio is 1:1.2；Interior side throwing
The both sides Slope ratio of stone weir body is 1:1.2, outside jackstone weir body is higher than inside jackstone weir body.
More particularly, after the body construction to object height of medial and lateral jackstone weir, dump truck land transportation clay is existing to constructing
, using excavator, loading machine and loading machine toward landfill clay between the body of inside and outside jackstone weir to cofferdam top surface, form native stone and enclose
Weir.The two level clay weir body of construction 3m elevations above earth rock cofferdam, two level clay weir body bottom width are 15.5m, top width
For 5.0m, medial and lateral side slope is 1:1.75.
Further preferably, plastic concrete hole-drilling interlocking pile diameter 1200mm, stake spacing 900mm are engaged 300mm, enter rock
3.5m.It is drilled using four clean-out machines, makes mud off by oneself, jump hole construction, underwater casting plastic concrete, plasticity coagulation
Native intensity index is the same as former material for diaphragm wall of Cofferdam plastic concrete.Plastic concrete hole-drilling interlocking pile is divided into a sequence stake and two sequence stakes, and one
The concrete of sequence stake and two sequence stakes is merged in embedded occlusive state and forms continuous, closing a whole campshed knot
Structure.
By the above method, the present invention also provides a kind of immersed tube tunnels to rebuild cofferdam structure, including substrate, inside jackstone
Weir body, outside jackstone weir body, first grade clay weir body, two level clay weir body, it is characterised in that：The substrate is a former cofferdam quilt
Residue after destroying by rush of water fills sand long tube bag and riverbed, jackstone weir body and outside jackstone weir body on the inside of the formation of substrate both sides jackstone block；
Clay is filled between interior side throwing stone weir body and outside jackstone weir body and forms first grade clay weir body, inside jackstone weir body, outer side throwing
Stone weir body and first grade clay weir body constitute earth rock cofferdam, and two level clay weir body is filled above earth rock cofferdam；First grade clay weir
The drilling of body middle part simultaneously pours plastic concrete hole-drilling interlocking pile.
Preferably, the side slope and top surface in first grade clay weir body and two level clay weir body are laid with reinforced mesh and mould builds morning
Reinforced concrete；Side slope top of the slope, bottom of slope and knick point position reinforced mesh are continuously set；Side slope and top of the slope squeeze into the net of fixed steel bars
Piece reinforcing bar, reinforcing bar and reinforced mesh binding are secured.
Beneficial effects of the present invention：Earth rock cofferdam rebuild weir body and its seepage prevention system have stable structure, anti-permeability performance it is good,
The advantages that cost is relatively low, operation is convenient, safe, the duration is controllable and economic, the residue after being destroyed by rush of water in a former cofferdam
It fills on the basis of sand long tube bag and riverbed and quickly rebuilds cofferdam, reference value is provided for similar cofferdam construction of rebuilding from now on.
Description of the drawings
Fig. 1 is to rebuild cofferdam drawing in side sectional elevation.
Fig. 2 is to rebuild cofferdam transverse plane figure.
In figure：1. base, 2. outside jackstone weir bodies, 3. inside jackstone weir bodies, 4. first grade clay weir bodies, 5. two level clay weirs
Section and immersed segment boundary, 9. plastic concrete hole-drilling interlocking piles are secretly buried in body, 6. riverbeds, 7. steel-pipe piles, 8..
Specific embodiment
Here by Hong Gutan Ganjiang River, Nanchang section rebuild cofferdam construction for illustrate the present invention detailed construction method, but this
It is not intended that the limitation to application range of the present invention, present invention may also apply to other rivers, lakeside, seashores to rebuild cofferdam and apply
Work.
Fig. 1 rebuilds cofferdam drawing in side sectional elevation for Hong Gutan Ganjiang River, Nanchang section, and Fig. 2 rebuilds cofferdam for Hong Gutan Ganjiang River, Nanchang section and puts down
Face figure.Work progress is described in detail referring to Fig. 1 and Fig. 2.
(1) riverbed~15.0m elevation ranges weir body construction
Original is filled sand long tube sack cofferdam upstream and downstream weir body and is locally washed, and river stage casing weir body is destroyed by rush of water, and destroyed by rush of water weir body
There is 1~2 layer of long tube bag back-up sand bottom, closes up the weir body that destroyed by rush of water using earth rock cofferdam；It is poor to rebuild cofferdam construction environment, water level
Up to 15m, flow velocity is greatly to 0.8m/s.Cofferdam displacement and sedimentation variation during filling are big.In order to overcome constructional difficulties, this hair
It is bright destroyed by rush of water with a former cofferdam after residue to fill sand long tube bag and riverbed (6) be base (1), in base (1) both sides jackstone block
Form inside jackstone weir body (2) and outside jackstone weir body (3)；Side throwing stone weir body is according to first inside, rear outside inside and outside over-water construction
Sequence construction, stone is transported to river middle-end head circumference weir using ship, utilizes 8m3Grab carries out stone according to cofferdam axis
Underwater throwing closes up weir body.During the body construction of jackstone weir, periodically weir body is carried out to sweep survey, it is ensured that weir shape and Slope ratio
Meet design requirement.After the jackstone weir body construction to 15.0m elevations of medial and lateral, dump truck land transportation clay to construction site utilizes
Excavator, loading machine and loading machine inside between side throwing stone weir body (2), outside jackstone weir body (3) landfill clay to cofferdam top surface
First grade clay weir body (4) is formed, inside jackstone weir body (2), outside jackstone weir body (3) and first grade clay weir body (4) constitute soil
Stone cofferdam.
Earth rock cofferdam height about 17m, weir crest width be 46.1m, weir bottom width degree be 71.1m, weir body upstream face jackstone side slope
Than being 1:1.5, back side jackstone Slope ratio is 1:1.2.Outside jackstone weir body (2) elevation of top 15.0m, top width are
8m, bottom width 33.2m, the side Slope ratio that meets water are 1:1.5, land side Slope ratio is 1:1.2.Inside jackstone weir body
(3) elevation of top 12.0m, top width 8m, bottom width 31.9m, Slope ratio in both sides is 1:1.2, backwater side
Slope sets the platform of 3.0m wide in 8.0m elevations.The weir body form being combined using clay weir body and jackstone weir body, jackstone and clay
Under the conditions of specific hydrological environment from steady side slope, under the premise of meeting weir body and stablizing safety, reduce weir body section as possible
Size is preferably minimized the quantities that weir body is performed and removed, and can ensure that the plastic concrete in the body of later stage clay weir bores
Hole interlocking pile normal construction, it is ensured that the anti-seepage effect of weir body.
(2) 15.0~18.0m elevation ranges weir body constructions
In river after the completion of the construction of end earth rock cofferdam, the two level clay weir body (5) of construction 3m high, two level above earth rock cofferdam
Clay weir body (5) bottom width is 15.5m, and top width 5.0m, medial and lateral side slope is 1:1.75.First grade clay weir body (4)
Clay core sloping core is constituted with two level clay weir body (5), clay core sloping core amounts to 285m, and plane is divided into three sections and is applied
Work.Clay weir body construction Automobile Transportation clay to construction site, backfill layered backfill are built, per layer thickness 300mm, are utilized
20t road roller layered rollings, compactness reach 0.9.Two level clay weir body (5) is loaded using mechanized construction, configuration excavator
Mechanical equipments and the detecting instruments such as machine, dump truck vibrated roller form digging and fill, transport, shakeouing, rolling, detecting flowing water work
Industry.
(4) body side slope protection in clay weir is constructed
8@150 × 150mm reinforcing bars of φ are used in the side slope and top surface of first grade clay weir body (4) and two level clay weir body (5)
The early strong form concretes of mesh sheet+100mm thickness C20, reinforced mesh size are 2000 × 2000mm, lap of splice 300mm, Slope
Top, bottom of slope and knick point position reinforced mesh must continuously be set.Side slope and top of the slope squeeze into φ 22 (L=1m) reinforcing bar fixed steel bars
Mesh sheet, sets 2000 × 2000mm of spacing, and reinforcing bar and reinforced mesh binding are secured.Pre-buried φ before side slope surface concrete construction
100PVC is as drain hole, sluicing 2500 × 2500mm of pitch of holes, and pvc pipe length is 0.5m, outsourcing 80 mesh Dense mesh screens of bilayer.
(5) plastic concrete skills in drilling occlusive pile construction
It drills in the middle part of first grade clay weir body (4), pours plastic concrete hole-drilling interlocking pile (9), plastic concrete drilling
Interlocking pile (9) diameter 1200mm, stake spacing 900mm are engaged 300mm, enter rock 3.5m.The weir body that destroyed by rush of water slits along axis is concave
Mouthful, hole-drilling interlocking pile job area stratum is mainly the back-up sand of long tube bag and clay do not destroyed by rush of water, wherein gap both sides layer of sand
Thicker, intermediate layer of sand is relatively thin.Clay can not be tamped during filling in the middle part of earth rock cofferdam, and the naturally closely knit time is long, utilizes rotation
Dig drilling machine can not pore-forming, constructed using smaller clean-out machine is disturbed to surrounding formations, clean-out machine job scheduling
Slowly.The present invention jumps hole construction, underwater casting in the four clean-out machine drillings of 92m long ranges reasonable disposition, self-control mud off
Plastic concrete, plastic concrete intensity index is the same as former material for diaphragm wall of Cofferdam plastic concrete.Plastic concrete hole-drilling interlocking pile (9)
It is divided into a sequence stake and two sequence stakes, the concrete of a sequence stake and two sequence stakes is merged in embedded occlusive state and forms a company
Continuous, closing whole piling structure.
(6) triple pipe rotary spray pile driving construction
It constructs in plastic concrete hole-drilling interlocking pile (9) corner and with original plastic concrete cut-off wall joint part Triple pipe spiral spraying pile, using tri-tube method drilling machine construction, 6 rotary churning piles of often place's construction, adjacent studs overlap joint should not be small
In 300mm, weathering argillaceous siltstoue 3.5m during stake bottom enters.Rotary churning pile is not less than 42.5 normal silicate using strength grade
Cement, cement mixed ratio are not less than 25%, and the ratio of mud of cement grout is 1.0~1.5, and unconfined compressive strength (28d) >=
0.8MPa, infiltration coefficient≤1.0x10-7cm/s, churning pressure are preferably controlled in 15~20MPa.
Claims (1)
1. a kind of immersed tube tunnel rebuilds the construction method of seepage prevention of cofferdam system, it is characterised in that step is as follows：
First, the residue after being destroyed by rush of water using cofferdam of original fills sand long tube bag and riverbed as substrate, and in substrate both sides, jackstone block is formed
Inside jackstone weir body and outside jackstone weir body；
2nd, clay is filled between interior side throwing stone weir body and outside jackstone weir body and forms first grade clay weir body, inside jackstone weir body,
Outside jackstone weir body and first grade clay weir body constitute earth rock cofferdam, after the completion of earth rock cofferdam construction, are filled out above earth rock cofferdam
Two level clay weir body is built, pre-buried pvc pipe is as drain hole before side slope surface concrete construction, in first grade clay weir body and two level
The side slope of clay weir body and top surface are laid with reinforced mesh and mould builds early strength concrete；Side slope top of the slope, bottom of slope and knick point position steel
Muscle mesh sheet must continuously be set；Side slope and top of the slope squeeze into the mesh sheet reinforcing bar of fixed steel bars, and reinforcing bar and reinforced mesh binding are secured；Soil
The weir body upstream face jackstone side slope ratio in stone cofferdam is 1:1.5, back side jackstone Slope ratio is 1:1.2；Outside jackstone weir body
The side Slope ratio that meets water is 1:1.5, land side Slope ratio is 1:1.2；The both sides Slope ratio of inside jackstone weir body is 1:
1.2, outside jackstone weir body is higher than inside jackstone weir body；The medial and lateral side slope of two level clay weir body is 1:1.75；
3rd, construction plastic concrete hole-drilling interlocking pile, plastic concrete skills in drilling occlusive pile construction process in the middle part of the body of first grade clay weir
In, it is drilled using four clean-out machines, makes mud off by oneself, jump hole construction, underwater casting plastic concrete, plastic concrete
Intensity index is the same as former material for diaphragm wall of Cofferdam plastic concrete；Plastic concrete hole-drilling interlocking pile is divided into a sequence stake and two sequence stakes, a sequence
The concrete of stake and two sequence stakes is merged in embedded occlusive state and forms continuous, closing a whole piling structure；
Plastic concrete hole-drilling interlocking pile corner and with original plastic concrete cut-off wall joint part construct triple pipe spiral spraying pile.
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| CN201610330307.7A CN105839653B (en) | 2016-05-18 | 2016-05-18 | A kind of immersed tube tunnel rebuilds the construction method of seepage prevention of cofferdam system |
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| CN201610330307.7A CN105839653B (en) | 2016-05-18 | 2016-05-18 | A kind of immersed tube tunnel rebuilds the construction method of seepage prevention of cofferdam system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107130644A (en) * | 2016-11-11 | 2017-09-05 | 新疆北方建设集团有限公司 | Coffering composite geo-membrane and gravelly clay combination against seepage construction method |
| CN114960756B (en) * | 2021-02-26 | 2024-01-09 | 宝山钢铁股份有限公司 | Underwater net-hanging masking type tunnel and construction method thereof |
| CN113266028B (en) * | 2021-05-17 | 2022-05-17 | 中电建十一局工程有限公司 | Construction method of sea area beach section highway riprap cofferdam seepage prevention system |
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